This series includes more than 20 representative works, ranging from three essays written by Marx after graduating from high school to "Ludwig Feuerbach and the End of German Classical Philosophy" written by Engels in his later years. It aims to present the research status, research conclusions and research methods of domestic and foreign scholars on these classic texts of Marx and Engels as objectively and comprehensively as possible, with a view to providing reference and reference for teachers and students in Marxist colleges to study and study Marxist classics. Marxist theory is the special skill for us to do all our work well, and it is also the special skill for successful work that leading cadres must universally master.